National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

74°F

23°C

Humidity 71%
Wind Speed SE 15 mph
Barometer 29.99 in (1014.8 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 4 Mar 8:56 pm CST
Extended Forecast for

4 Miles SW San Marcos TX

  • Tonight

    Tonight: Increasing clouds, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 67 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 84. South southeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

    High: 84 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms after midnight. Increasing clouds, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 66 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 83. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: Showers likely, then showers and possibly a thunderstorm after noon. High near 83. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    High: 83 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 59. North northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 59 °F

    Showers

  • Sunday

    Sunday: Showers, with thunderstorms also possible after noon. High near 72. Northeast wind 5 to 10 mph. Chance of precipitation is 80%.

    High: 72 °F

    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 63. Northeast wind around 5 mph becoming east southeast after midnight.

    Low: 63 °F

    Chance
    Showers

Detailed Forecast

Tonight
Increasing clouds, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 84. South southeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Thursday Night
A 30 percent chance of showers and thunderstorms after midnight. Increasing clouds, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.
Friday
Showers likely, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 83. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South southeast wind around 10 mph, with gusts as high as 20 mph.
Saturday
Showers likely, then showers and possibly a thunderstorm after noon. High near 83. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Saturday Night
Showers and possibly a thunderstorm. Low around 59. North northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Sunday
Showers, with thunderstorms also possible after noon. High near 72. Northeast wind 5 to 10 mph. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 63. Northeast wind around 5 mph becoming east southeast after midnight.
Monday
A 50 percent chance of showers. Mostly cloudy, with a high near 83.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Tuesday
Showers likely. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.
Wednesday
A 20 percent chance of showers. Sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW San Marcos TX
 29.86°N 97.99°W (Elev. 748 ft)
Last Update:
8:57 pm CST Mar 4, 2026
Forecast Valid:
9pm CST Mar 4, 2026-6pm CDT Mar 11, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation